#
#  Plex Extension Framework
#  Copyright (C) 2008-2012 Plex, Inc. (James Clarke, Elan Feingold). All Rights Reserved.
#

import Framework
import os, datetime, weakref, shutil
import templates
from serialization import Serializable
from combination import Combinable

  
class AttributeSet(object):
  def __getattribute__(self, name):
    if name[0] != '_' and name in self._attributes:
        return self._attributes[name]._getcontent()
    return object.__getattribute__(self, name)

  def __setattr__(self, name, value):
    if name[0] == '_':
      object.__setattr__(self, name, value)
      
    # Only allow setting the id if the model isn't read-only
    elif name == 'id':
      if self._access_point._read_only:
        raise Framework.exceptions.FrameworkException("Data for %s instance %s provided by %s can't be modified" %  (type(self).__name__, self._uid, self.provider))
      self._id = value
    
    elif name in self._attributes:
      try:
        self._attributes[name]._setcontent(value)
      except:
        #print "Exception setting attribute '%s' of %s to %s" % (name, str(self), str(value))
        raise
    
    else:
      raise AttributeError("'%s' object has no attribute named '%s'" % (type(self).__name__, name))
      
  # Separate getter/setter for synthetic attributes - these can only be set via interfaces
  def _has_synthetic_attr(self, name):
    return name in self._synthetic_attributes
  
  def _get_synthetic_attr(self, name):
    if name in self._synthetic_attributes:
      return self._synthetic_attributes[name]._getcontent()
    raise Framework.exceptions.FrameworkException("No synthetic attribute named '%s' found" % name)
    
  def _set_synthetic_attr(self, name, value):
    if name in self._synthetic_attributes:
      try:
        self._synthetic_attributes[name]._setcontent(value)
        return
      except:
        #print "Exception setting synthetic attribute '%s' of %s to %s" % (name, str(self), str(value))
        raise
    raise Framework.exceptions.FrameworkException("No synthetic attribute named '%s' found" % name)
    
  
class AttributeObject(object):
  
  def __init__(self, owner, template, name):
    self._owner_ref = weakref.ref(owner)
    self._template_ref = weakref.ref(template)
    self._name = name
    if hasattr(self, '_init'):
      self._init()
  
  @property
  def _owner(self):
    return self._owner_ref()
    
  @property
  def _template(self):
    return self._template_ref()
  
  @property
  def _core(self):
    return self._owner._core
    
  @property
  def _external(self):
    return self._template._external
    
  @property
  def _data_ext(self):
    return self._template._data_ext
    
  @property
  def _access_point(self):
    return self._owner._access_point
    
  @property
  def _model(self):
    return self._owner._model
    
  def _getcontent(self):
    pass
  
  def _setcontent(self, content):
    if self._access_point._read_only:
      raise Framework.exceptions.FrameworkException("Data for %s instance %s provided by %s can't be modified" %  (type(self._model).__name__, self._model._uid, self._access_point._identifier))
    
  def _save(self):
    self._owner._save()



class ValueObject(AttributeObject, Serializable):
  _type = None
  
  def _init(self):
    self._value = None
      
  def _getcontent(self):
    return self._value
  
  def _setcontent(self, content):
    AttributeObject._setcontent(self, content)
    if content != None and not isinstance(content, type(self)._type):
      raise Framework.exceptions.AttributeTypeMismatch("Provided content of type '%s' is not of the required type '%s'." % (type(content).__name__, type(self)._type.__name__))
    self._value = content
    self._save()
    
  def _serialize(self, path):
    el = self._core.data.xml.element(self._name)
    content = self._getcontent()
    
    if content is not None or self._template._allows_null:
      try:
        el.text = unicode(content)
      except:
        print "Exception serializing '%s'" % unicode(content)
        raise
    
    if self._external:
      el = self._writedata(path, str(content))
    
    return el
    
  def _deserialize(self, path, el):
    if bool(el.get("external")) == True:
      content_str = self._readdata(path)
    else:
      content_str = el.text
    try:
      if content_str == None or content_str == 'None':
        self._value = None
      else:
        self._value = type(self)._type(content_str) 
    except:
      print "Error deserializing "+content_str
      raise
      
  def _to_string(self):
    content = self._getcontent()
    if content or self._template._allows_null:
      return unicode(content)


class StringObject(ValueObject):
  _type = unicode
  
  def _setcontent(self, content):
    AttributeObject._setcontent(self, content)
    if not (content == None or isinstance(content, unicode)):
      content = unicode(content)
    ValueObject._setcontent(self, content)

  
class IntegerObject(ValueObject):
  _type = int
  

  
class FloatObject(ValueObject):
  _type = float

  
  
class BooleanObject(ValueObject):
  _type = bool
  
  
  
class DateObject(ValueObject):
  _type = datetime.date
  
  def _setcontent(self, content):
    if isinstance(content, datetime.datetime):
      content = content.date()
    return ValueObject._setcontent(self, content)
  
  def _deserialize(self, path, el):
    if bool(el.get("external")) == True:
      content_str = self._readdata(path)
    else:
      content_str = el.text
    if content_str != None and len(content_str) > 0:
      self._value = datetime.datetime.strptime(content_str, "%Y-%m-%d").date()
  
  
class TimeObject(ValueObject):
  _type = datetime.time
  #TODO: deserialization
  
  
class DatetimeObject(ValueObject):
  _type = datetime.datetime
  #TODO: deserialization
  
  
class DataObject(AttributeObject, Serializable):
  
  def _init(self):
    self._data = str()
    
  def _getcontent(self):
    return self._data
    
  def _setcontent(self, content):
    AttributeObject._setcontent(self, content)
    self._data = str(content)
    self._save()
    
  def _serialize(self, path):
    if not self._external:
      raise Framework.exceptions.FrameworkException("Data objects must always be saved externally.")
    else:
      content_str = str(self._getcontent())
      return self._writedata(path, content_str)
      
  def _deserialize(self, path, el=None):
    content_str = self._readdata(path)
    self._data = content_str
    



class ContainerObject(AttributeObject, Serializable):
  def _getcontent(self):
    return self
    
  def _setcontent(self, content):
    raise Framework.exceptions.FrameworkException("Container-type attributes can't be assigned directly.")
    


class ItemObject(AttributeObject):
  def __init__(self, obj, name):
    AttributeObject.__init__(self, obj._owner, obj._template, name)
    self._obj = obj

  def _getcontent(self): return self._obj._getcontent()
  def _setcontent(self, content): return self._obj._setcontent(content)

  @property
  def _external(self): return self._obj._external

  @property
  def _data_ext(self): return self._obj._data_ext


class MapItem(ItemObject, Serializable):
  _attr_name = 'key'
  
  def _serialize(self, path):
    if not isinstance(self._obj, Serializable):
      raise Framework.exceptions.FrameworkException("Mapping item %s is not serializable!" % repr(self._obj))
    attr_el = self._obj._serialize(path)
    if attr_el is not None:
      attr_el.set(type(self)._attr_name, self._name)
    return attr_el


class MapObject(ContainerObject, Serializable):
  _item_class = MapItem
  
  def _init(self):
    self._items = dict()
    
  def _serialize(self, path):
    el = self._core.data.xml.element(self._name)
    
    if os.path.exists(path):
      shutil.rmtree(path)
    
    for name in self._items:
      item = self._items[name]
      item_el = item._serialize(os.path.join(path, item._name))
      if item_el is not None:
        el.append(item_el)
            
    if self._external:
      el = self._writedata(path, self._core.data.xml.to_string(el))
    
    return el
    
  def _deserialize(self, path, el):
    if bool(el.get('external')) == True:
      el = self._core.data.xml.from_string(self._readdata(path))
    for item_el in el.getchildren():
      name = item_el.get(type(self)._item_class._attr_name)
      obj = self._template._item_template._new(self, 'item')
      obj._deserialize(os.path.join(path, name), item_el)
      self._items[name] = type(self)._item_class(obj, name)
    
  def __getitem__(self, name):
    name = unicode(name)
    if name in self._items:
      return self._items[name]._obj._getcontent()
    elif isinstance(self._template._item_template, templates.RecordTemplate):
      obj = self._template._item_template._new(self, 'item')
      self._items[name] = type(self)._item_class(obj, name)
      return self._items[name]._getcontent()
      
  def __setitem__(self, name, value):
    name = unicode(name)
    if name in self._items:
      self._items[name]._obj._setcontent(value)
    else:
      obj = self._template._item_template._new(self, 'item')
      obj._setcontent(value)
      self._items[name] = type(self)._item_class(obj, name)
      self._save()
      
  def __delitem__(self, name):
    if name in self._items:
      del self._items[name]
      
  def __iter__(self):
    return self._items.__iter__()
    
  def __len__(self):
    return self._items.__len__()
    
  def __contains__(self, name):
    return name in self._items
    
  def keys(self):
    return self._items.keys()
    
  def validate_keys(self, valid_keys):
    for key in self.keys():
      if key not in valid_keys:
        del self[key]
      
      
class DirectoryObject(MapObject, Serializable, Combinable):
  
  def _init(self):
    if not isinstance(self._template._item_template, templates.DataTemplate):
      raise Framework.exceptions.FrameworkException("Incorrect template type (%s): Directory attributes can only hold Data items." % self._template._item_template)
    MapObject._init(self)
    
  def _serialize(self, path):
    # Same as above, but don't append item elements to the XML
    el = self._core.data.xml.element(self._name)

    if os.path.exists(path):
      shutil.rmtree(path)
    
    for name in self._items:
      item = self._items[name]
      item._serialize(os.path.join(path, item._name))
      
    if self._external:
      el = self._writedata(path, self._core.data.xml.to_string(el))

    return el
    
  def _deserialize(self, path, el):
    if os.path.exists(path):
      for name in os.listdir(path):
        obj = self._template._item_template._new(self, 'item')
        obj._deserialize(os.path.join(path, name), el)
        self._items[name] = type(self)._item_class(obj, name)


class ProxyObject(object):

  def __init__(self, proxy_name, proxy_type, data, sort_order=None, ext=None, index=None, codec=None, format=None, **kwargs):
    self._proxy_name = proxy_name
    self._proxy_type = proxy_type
    self._data = data
    self._sort_order = sort_order
    self._ext = ext
    self._index = index
    self._codec = codec
    self._format = format
    self._extras = kwargs
    
  def __getitem__(self, name):
    return self._extras.get(name)
    
  def __setitem__(self, name, value):
    self._extras[name] = value


class ProxiedDataObject(DataObject):
  
  def _init(self):
    DataObject._init(self)
    self._proxy_type = 'unknown'
    self._sort_order = None
  
  def _setcontent(self, content):
    self._proxy_type = content._proxy_type
    self._sort_order = content._sort_order
    DataObject._setcontent(self, content._data)
  
  
class ProxyContainerItem(MapItem):
  
  _attr_name = 'url'
  
  def __init__(self, obj, name):
    if not isinstance(obj, ProxiedDataObject):
      raise Framework.exceptions.FrameworkException("Incorrect object type (%s): Must be a Proxied Data object." % type(obj))
    MapItem.__init__(self, obj, name)
  
  @property
  def _proxy_type(self):
    return self._obj._proxy_type

  @_proxy_type.setter
  def _proxy_type(self, value):
    self._obj._proxy_type = value

  @property
  def _sort_order(self):
    return self._obj._sort_order

  @_sort_order.setter
  def _sort_order(self, value):
    self._obj._sort_order = value


    
    
class ProxyContainerObject(MapObject, Serializable, Combinable):
  
  _item_class = ProxyContainerItem
  
  def _init(self):
    if not isinstance(self._template._item_template, templates.DataTemplate):
      raise Framework.exceptions.FrameworkException("Incorrect template type (%s): ProxyContainer attributes can only hold Data items." % self._template._item_template)
    MapObject._init(self)
    
  def _serialize(self, path):
    el = self._core.data.xml.element(self._name)

    if os.path.exists(path):
      shutil.rmtree(path)
      
    sorted_items = {}
    other_items = []
    
    for url in self._items:
      item = self._items[url]
      url_hash = self._core.data.hashing.sha1(url)
      item_el = item._serialize(os.path.join(path, url_hash))
      
      if item_el is not None:
        item_el.set(item._proxy_type, url_hash)
        if item._sort_order:
          item_el.set('sort_order', str(item._sort_order))
          if item._sort_order not in sorted_items:
            sorted_items[item._sort_order] = []
          sorted_items[item._sort_order].append(item_el)
        else:
          other_items.append(item_el)
          
    for order in sorted(sorted_items.keys()):
      for item_el in sorted_items[order]:
        el.append(item_el)
    
    for item_el in other_items:
      el.append(item_el)

    return el
    
  def _deserialize(self, path, el):
    for item_el in el.getchildren():
      attr_name = type(self)._item_class._attr_name
      url = item_el.get(attr_name)
      proxy_type = 'unknown'
      
      for key in item_el.keys():
        if key not in [attr_name, 'external']:
          proxy_type = key
          break
          
      url_hash = self._core.data.hashing.sha1(url)
      obj = self._template._item_template._new(self, 'item')
      obj._proxy_type = proxy_type
      if 'sort_order' in item_el.attrib:
        obj._sort_order = int(item_el.attrib['sort_order'])
      obj._deserialize(os.path.join(path, url_hash), item_el)
      self._items[url] = type(self)._item_class(obj, url)
      
  def __setitem__(self, name, value):
    if not isinstance(value, ProxyObject):
      raise Framework.exceptions.FrameworkException("Incorrect value type (%s): Must be a Proxy object." % type(value))
    if value._proxy_name not in self._template._accepted_proxies:
      raise Framework.exceptions.FrameworkException("Proxy type '%s' is not accepted by this attribute." % value._proxy_name)
    MapObject.__setitem__(self, name, value)
      
class SetItem(ItemObject, Serializable):
  def _serialize(self, path):
    if not isinstance(self._obj, Serializable):
      raise Framework.exceptions.FrameworkException("Set item %s is not serializable!" % repr(self._obj))
    attr_el = self._obj._serialize(path)
    return attr_el
      
      
class SetObject(ContainerObject, Serializable, Combinable):
  
  def _init(self):
    self._items = list()
    
  def add(self, value):
    obj = self._template._item_template._new(self, 'item')
    obj._setcontent(value)
    self._items.append(obj)
    self._save()
    
  def clear(self):
    self._items = list()
    self._save()  
  
  def new(self):
    if not isinstance(self._template._item_template, templates.RecordTemplate):
      raise Framework.exceptions.FrameworkException("This attribute type does not support creating new instances.")
    obj = self._template._item_template._new(self, 'item')
    self._items.append(obj)
    self._save()
    return obj
    
  def find(self, **kwargs):
    for item in self._items:
      found = True
      content = item._getcontent()
      for name in kwargs:
        value = kwargs[name]
        if not (hasattr(content, name) and getattr(content, name) == value):
          found = False
      if found:
        return content
          
  def _serialize(self, path):
    el = self._core.data.xml.element(self._name)
    
    count = 0
    for item in self._items:
      attr_el = item._serialize(os.path.join(path, str(count)))
      if attr_el is not None:
        attr_el.set('index', str(count))
        el.append(attr_el)
      count += 1
      
    if self._external:
      el = self._writedata(path, self._core.data.xml.to_string(el))
      
    return el
    
  def _deserialize(self, path, el):
    if bool(el.get("external")) == True:
      el = self._core.data.xml.from_string(self._readdata(path))
      
    for item_el in el.getchildren():
      obj = self._template._item_template._new(self, 'item')
      obj._deserialize(os.path.join(path, item_el.get("index")), item_el)
      self._items.append(obj)
      
  # TODO: Exceptions
  def __getitem__(self, pos):
    if pos >= 0 and pos < len(self._items):
      return self._items[pos]._getcontent()

  def __setitem__(self, pos, value):
    if pos >= 0 and pos < len(self._items):
      self._items[pos]._setcontent(value)
      self._save()
      
  def __iter__(self):
    l = list()
    for item in self._items:
      l.append(item._getcontent())
    return l.__iter__()

  def __len__(self):
    return self._items.__len__()
    
  def _setcontent(self, content):
    if isinstance(content, list):
      self.clear()
      for item in content:
        self.add(item)
    else:
      ContainerObject._setcontent(self, content)
    
      
    
class LinkObject(AttributeObject, Serializable):
  
  def _init(self):
    self._link_uid = None
    
  def _serialize(self, path):
    if self._external:
      raise FrameworkException("Link attributes can't be saved externally.")
    el = self._core.data.xml.element(self._name)
    if self._link_uid:
      el.text = self._link_uid
    return el
    
  def _deserialize(self, path, el):
    self._link_uid = el.text
    
  def _getcontent(self):
    if self._link_uid:
      cls = getattr(self._access_point, self._template._item_template.__name__)
      return cls[self._link_uid]
      
  def _setcontent(self, content):
    AttributeObject._setcontent(self, content)
    cls = getattr(self._access_point, self._template._item_template.__name__)
    if str(type(content)) != str(cls):
      raise Framework.exceptions.FrameworkException("Attribute must be set to a %s object" % cls.__name__)
    else:
      self._link_uid = content._uid
      content._write()
      self._save()


class RecordObject(AttributeObject, AttributeSet, Serializable, Combinable):
  
  def _init(self):
    attrs = dict()
    cls = type(self._template)
    for name in dir(cls):
      template = getattr(cls, name)
      
      if isinstance(template, templates.AttributeTemplate):
        attrs[name] = template._new(self, name)
        
    self.__dict__['_attributes'] = attrs
    
  def _getcontent(self):
    return self
    
  def _serialize(self, path):
    el = self._core.data.xml.element(self._name)
    
    for name in self._attributes:
      attr = self._attributes[name]
      attr_el = attr._serialize(os.path.join(path, attr._name))
      if attr_el is not None:
        el.append(attr_el)
        
    if self._external:
      el.tag = type(self._template).__name__
      el = self._writedata(path, self._core.data.xml.to_string(el))

    return el

  def _deserialize(self, path, el):
    if bool(el.get('external')) == True:
      el = self._core.data.xml.from_string(self._readdata(path))
    if el is not None:
      for attr_el in el.getchildren():
        if attr_el.tag in self._attributes:
          attr = self._attributes[attr_el.tag]
          attr._deserialize(os.path.join(path, attr_el.tag), attr_el)
        